18620720

素因数分解:

$2^4\times 5^1\times {\mathrm{43}}^1\times {\mathrm{5413}}^1$

素因数の和:5469

約数の個数: 40

約数和(自身を含む): 44308176

約数和(自身を除く): 25687456

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 40, 43, 80, 86, 172, 215, 344, 430, 688, 860, 1720, 3440, 5413, 10826, 21652, 27065, 43304, 54130, 86608, 108260, 216520, 232759, 433040, 465518, 931036, 1163795, 1862072, 2327590, 3724144, 4655180, 9310360, 18620720]

約数ペア:

[(1, 18620720), (2, 9310360), (4, 4655180), (5, 3724144), (8, 2327590), (10, 1862072), (16, 1163795), (20, 931036), (40, 465518), (43, 433040), (80, 232759), (86, 216520), (172, 108260), (215, 86608), (344, 54130), (430, 43304), (688, 27065), (860, 21652), (1720, 10826), (3440, 5413)]